Can you still see a an image if you look at the screen under bright light? Many times, the backlight in an LCD will go out, but the image will still be there.Can you still see a an image if you look at the screen under bright light? Many times, the backlight in an LCD will go out, but the image will still be there.

Check the video cable, make sure it is not loose. Try the monitor on another computer to see if it works.
If not then follow these instrucrions :-
When the LCD monitor display is dim or flickers and or has a black screen then the fault is usually a faulty inverter or the CCFL lamp. When you look at the screen at a sharp angle and you see a dim image then it is a backlight problem and it is caused by a faulty inverter or a CCFL lamp.Check out LCD Parts for parts, service, and DIY info. Use this link to their WEB site :-www.lcdparts.net

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First check the vga cable, video cards of your pc.if all of these are ok open your LCD monitor check the power board for boated capacitor, open secondary pico fuse or fuseble resistor, replace it with the same value. The defective lcd panel can cause of dim dispaly but the power is ok.

check your resolution settings and change to 800><600 and try again.If it does not work at 1024><768 try loading monitor driver In display properties it should show BenQ FP731 instead of plug and play monitor.
Samir

Resolder the power transistors on inverter board and also check them.If display is not there at all some of this 4 transistors C5707 should be defective.Check associated fuse and Fet which drives the transistor.

Dor, BenQ has a 3yr warranty on their monitors. I would contact their tech support and receive an RMA to return it for repair. It will cost you shipping out there but they will ship it back. I has a BenQ FP731 myself and it blew a capacitor inside that allowed the screen to stay on. Fixed it and had it back in 5-7 days. Good luck.